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解题思路:

注意事项:

参考代码:

class Date:


    def __init__(self):
        self.__year = 0
        self.__month = 0
        self.__day = 0


    def Set(self, time):
        year, month, day = map(int, time.split("-"))
        self.__year = year
        self.__month = month
        self.__day = day


    def print(self):
        print(f"{self.__year}:{self.__month}:{self.__day}")


if __name__ == "__main__":
    t = Date()
    time = input()
    t.Set(time)
    t.print()